Firegrate



Ncv. 20, 1928. 1,692,323 A. S. R. ARAUJ u FIRE GRATE Filed No'v. 2, 1926 Rtfolrn y Patented Nov. 20, 1928. i; Nl,TuD'srArEs PATENT,oFEicE.

f ,AinI'L'ARD-f SANTA 15.05A anfitrio.` or Rio nn multim, BRAZIL.v if

` f rApplication lcdNovember 2, 1926, Serial Noi 145,740, and Brazil `lioven/ibertS, 1925'.

1 The present invention has reference toiinprovements in fire grates'and relates more particularly to a grate of the shaking type' composed of alternately disposed Stationary and slidingly recipr'ocable gratemembers,v

and :its object is to provide a shaking grate,v

which'can be operated witha high degree of efiiciency with a relatively small expenditure of force and .which is especially adapted kfor use with rather inferior fuel materiali tending to cake and yielding av large lamount of residue. fv c The invention essentially comprises a grate, preferably of the sectional typefin which a reciproc-ably-movable baris disposed between f Scrapers and fuel turners, as will be fully de* scribed further on. The shaking operation is effec-ted by relatively displacing only ap-v proximately one-half of the total grate area. In order to make my invention more readily understood, I will now describe it in detailvin connection with the accompanying drawing, in which Fig. 1 shows one of the stationary grate bars in side elevation; Fig. 2 is a longitudinal section therethrough; Fig. 3 is a side view of one of the reciprocating grate bars, of which Fig. 4 is a plan view. Fig. 5 is a fragmental side view, in more or less diagrammatic showing, of the assembled grate structure; Fig. 6 is a plan view thereof with the dead plate 8 and the part to which it is attached omitted; Fig. 7 is a cross-section through one movable and twol stationary bars, on line 7-7 of Fig. 5; and Fig. 8 is a similar section through a modification.

The stationary portion of the grate is composed of front and rear cross-supports 1 and intermediate longitudinal supports 2, v:suitably mounted on the furnace bed 3. The grate bars are partly lfixed and partly Slidingly reciprocable. The stationary bars 4, shown in Figs. 1 and 2, are preferably of the air-cooled type and present a median hump 5 and the terminal half-humps 6 respectively. The notched half-bumped extremities are hung upon the grate supports 7 extending from the supports 1 in a well known manner,

as shown in Fig. 5. The extremities of the barsare preferably extended toward' the fire door and the bridge; respectively, to cooper ate'at these points with separate dead plates 8, for 'preventing loss of fuel during the shaking operation. VThe arrangement described i thus :far-does not differ from the-prior art. vThe'movableportion of the grate is composed of cross-braced supporting-frames 9, the number of which depends upon the number of sectionslin which the gratey is lsubdivided. `Eachrframe 9 is vmounted for'roll-4 and project partly over the flanking bars 4,

as shown in Figs. 6 and 7 Y For relatively reciprocating the movable grate unit I may employ various means, hand or power operable. By way of example I have shown a hand operable device., The

instance by means of the cross-supports 111.

handle 13 operates the cranked link l14, of j which there may be several depending upon the number of sectlonsmto which the grate is divided, to which the outer end of the link ork links 14 are pivotally secured. The movable bars then move to and fro between thertwo flanking stationary bars, in close relation therewith but not in actual Contact, whereby the fuel resting upon the grate as a whole'is alternately moved up against the stationary humps or awa thorough shaking up, aerating and scraping 0E thereof.

` The arrangement, obviously, is not restrict-v ed to the use of/horizontal grates, but may also be used in grates of the inclined type. The walls of the grate members are thin to allow of thorough cooling, which tends to prevent caking of the fuel on the grate surface. The humps 12 of the shaker bars may be cast integrally with thebar body, or they may be individually attached thereto in suitable manner.

Instead of'providing the laterally extendfrom them, which causes a ing scraper humps l2 on the movable bars, I may, as shown in Figure 8, reverse the described arrangement and arrange broad humps l2() onA the fixed bars4, extending respectively partly overthe uniformly cross# sectioned shaker bars between their narrow` humps, the shaking and scraping elfect being" practically the same, as in the first described arrangement.

-l A grate structure` of the character described, comprising a plurality of stationary bars lcomprising single side bars and a plu tween, the center hump and an ,end half'- hump of an adjacent stationary bar, andV means for reciprocating the shiftable bars in unison,

2. A grate structure ofthecharacter de- .scribed7 comprising a plurality of stationary bars comprising` single side bars and a plurality of pairsof barsarranged therebetween and spaced therefrom andfrom each other,

each of saidbars having upon its top a central hump and an end half-hump, a shiftable bar .arranged between each of said pairs and o between each side barand the adjacent pair,

a pair of upstanding bodies vcarried by each shiftable bar and projecting beyond each side in overlying relation to and arranged between the center hump and an end half-hump of an adjacent stationary bar, and means for reciprocating the shiftable bars in unison, said shiftable bars each being in the form kel an elongated openframe toV provide an air cooling action'.

3. A grate structure of the character described comprising a set of stationary bars comprisingsingleside bars and a plurality `ot pairs of bars arranged therebetween and spaced therefrom and vlirom each other, each of said bars having upon its top a lcentral hump and an end half' hump, a set of shiftable bars comprising a single bar arranged between each of said pairs of stationary bars and between each sidebar and the adjacent pair of stationary bars, the bars otone set having laterally extending scraping projections partially. overhanging the upper surfaces of the adjacent bars of the other set, and means for reciprocating the shiftable bars in unison. l

In testimony whereof I affix my signature.\

ABEILARD SANTA ROSA ARUJO. 

